Hi Dhamendra Kumar, XQuery and BaseX are extremely productive technologies, But at the cost of a minimal learning time. I am sorry I cannot help at that point, You should take the time to read a few tutorials and have an overview of all the BaseX capabilities by reading the documentation starter sections. Best regards, Fabrice De : Dharmendra Singh [mailto:dharam.mahi@gmail.com] Envoyé : jeudi 17 août 2017 11:04 À : Fabrice ETANCHAUD; BaseX Objet : Re: [basex-talk] Implement read lock and write lock Thanks for your reply favrice, I am new in the BaseX so if you little explore. i have gone through the documentation within documentation these line has been given declare option query:read-lock "foo,bar"; declare option query:read-lock "batz"; declare option query:write-lock "quix"; i have the file structure: /bloomsbury/config/audit.xml so i have to lock the audit.xml so how can i do that. Regards Dharmendra Kumar Singh On Thursday, 17 August 2017 2:01 PM, Fabrice ETANCHAUD <fetanchaud@pch.cerfrance.fr<mailto:fetanchaud@pch.cerfrance.fr>> wrote: Hi Dharmendra Kumar, Maybe you shall have a look at the following resource : http://docs.basex.org/wiki/Transaction_Management Regards, Fabrice Etanchaud “Perfection is finally attained not when there is no longer anything to add, but when there is no longer anything to take away." Saint-Exupéry De : basex-talk-bounces@mailman.uni-konstanz.de<mailto:basex-talk-bounces@mailman.uni-konstanz.de> [mailto:basex-talk-bounces@mailman.uni-konstanz.de] De la part de DK Singh Envoyé : jeudi 17 août 2017 09:53 À : BaseX Objet : [basex-talk] Implement read lock and write lock Hi All, How can i implement read lock and write lock, any functions to do this Regards Dharmendra Kumar Singh